users: huge cleanup/dedupe, interface-based third-party services

shared "newUser" method is now "NewUserPostVerification", and is shared
between all routes which create a jellyfin account. The new
"NewUserFromInvite", "NewUserFromAdmin" and "NewUserFromConfirmationKey"
are smaller as a result. Discord, Telegram, and Matrix now implement the
"ContactMethodLinker" and "ContactMethodUser" interfaces, meaning code
is shared a lot between them in the NewUser methods, and the specifics
are now in their own files. Ombi/Jellyseerr similarly implement a
simpler interface "ThirdPartyService", which simply has ImportUser and
AddContactMethod routes. Note these new interface methods are only used
for user creation as of yet, but could likely be used in other places.

matrix.go

@@ -32,15 +32,6 @@ type UnverifiedUser struct {
 	User     *MatrixUser
 }
 
-type MatrixUser struct {
-	RoomID     string
-	Encrypted  bool
-	UserID     string
-	Lang       string
-	Contact    bool
-	JellyfinID string `badgerhold:"key"`
-}
-
 var matrixFilter = mautrix.Filter{
 	Room: mautrix.RoomFilter{
 		Timeline: mautrix.FilterPart{
@@ -277,6 +268,57 @@ func (d *MatrixDaemon) UserExists(userID string) bool {
 	return err != nil || c > 0
 }
 
+// Exists returns whether or not the given user exists.
+func (d *MatrixDaemon) Exists(user ContactMethodUser) bool {
+	return d.UserExists(user.Name())
+}
+
 // User enters ID on sign-up, a PIN is sent to them. They enter it on sign-up.
 
 // Message the user first, to avoid E2EE by default
+
+func (d *MatrixDaemon) PIN(req newUserDTO) string { return req.MatrixPIN }
+
+func (d *MatrixDaemon) Name() string { return lm.Matrix }
+
+func (d *MatrixDaemon) Required() bool {
+	return d.app.config.Section("telegram").Key("required").MustBool(false)
+}
+
+func (d *MatrixDaemon) UniqueRequired() bool {
+	return d.app.config.Section("telegram").Key("require_unique").MustBool(false)
+}
+
+// TokenVerified returns whether or not a token with the given PIN has been verified, and the token itself.
+func (d *MatrixDaemon) TokenVerified(pin string) (token UnverifiedUser, ok bool) {
+	token, ok = d.tokens[pin]
+	// delete(t.verifiedTokens, pin)
+	return
+}
+
+// DeleteVerifiedToken removes the token with the given PIN.
+func (d *MatrixDaemon) DeleteVerifiedToken(PIN string) {
+	delete(d.tokens, PIN)
+}
+
+func (d *MatrixDaemon) UserVerified(PIN string) (ContactMethodUser, bool) {
+	token, ok := d.TokenVerified(PIN)
+	if !ok {
+		return &MatrixUser{}, false
+	}
+	return token.User, ok
+}
+
+func (d *MatrixDaemon) PostVerificationTasks(string, ContactMethodUser) error { return nil }
+
+func (m *MatrixUser) Name() string                          { return m.UserID }
+func (m *MatrixUser) SetMethodID(id any)                    { m.UserID = id.(string) }
+func (m *MatrixUser) MethodID() any                         { return m.UserID }
+func (m *MatrixUser) SetJellyfin(id string)                 { m.JellyfinID = id }
+func (m *MatrixUser) Jellyfin() string                      { return m.JellyfinID }
+func (m *MatrixUser) SetAllowContactFromDTO(req newUserDTO) { m.Contact = req.MatrixContact }
+func (m *MatrixUser) SetAllowContact(contact bool)          { m.Contact = contact }
+func (m *MatrixUser) AllowContact() bool                    { return m.Contact }
+func (m *MatrixUser) Store(st *Storage) {
+	st.SetMatrixKey(m.Jellyfin(), *m)
+}